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I don't see a error code E8 listed.. I take it your tried unplugging unit for at least 30 minutes then reconnecting unit. Could be a bad controller or display. If unit hasn't been serviced in a long time.. it should be checked for proper coolant levels and leaks.

You can find the service manual here...files.totalhomesupply.com/data/LG/PTAC/LP123CD3Aservice.pdf

System has lost some of the refrigerant charge. This means the system has a refrigerant leak.
Have a reputable heating and air contraxctor find and repair the leak, recharge the system and it should run perfectly.

the e8 code has something to do with getting the control board wet. When u try to operate it with the controls on the unit nothing happens. But u can still use the remote to turn it on and adjust the fan and cooling settings. It may have collected some moisture or condensation or if you wer cleaning it it got wet. It should all work again once it dries out.

I have a Fujiaire split unit(wall type). I have this problem quite frequently, an error code E04 display, Try to look at the operating manual, it does not specify the problem, I check the compressor motor winding, the amount of F22 charge and clean the outdoor and indoor unit. Wonder why put an Error code when there is nothing on the troubleshooting list. But whenever the authorize repair man come for servicing, he could not tell me. Does anyone has a solution?????